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Advantech AE Technical Share Document

Date 2017/12/22 SR# 1-3306640533

Category ■FAQ □SOP Related OS N/A

Abstract How to use DNP3 protocol to inquire tag from ADAM-3600

Keyword TagLink Studio, DNP3, protocol, service

Related

Product ADAM-3600

Problem Description:

This document demonstrates how to use DNP3 protocol to inquire tag from ADAM-3600 as

DNP3 slave step-by-step. The concept of DNP3 and terminology are also introduced in this

document.

Answer:

The system architecture with DNP3 protocol is illustrated as bellow drawing.

ADAM-3600 acts as DNP3 Slave, which would allocate one Database and could be inquired by

DNP3 Master (Simulation PC) by LAN port.

Each session includes 1 Slave ID and 1 Master ID. ADAM-3600 supports 4 sessions as DNP3 Slave.

DNP3

Simulation PC

(DNP3 Master)

PC with TagLink

ADAM-3600

(DNP3 slave)

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Settings in TagLink for DNP3

1. Double click on “DNP3 Outstation”

2. Use the default port as 20000

3. Select Session

4. Enable this session

5. Slave Address is for iRTU ADAM-3600. We set it as “4” for Slave.

6. Master Address is for simulation PC. We set it as “3” for Master.

7. Set the number of I/O Tags you want to monitor

8. In this demo, we use DO to control the tag value.

9. Select the I/O Tags you want to monitor. Press OK.

10. Apply for the configuration changed.

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11. Download to iRTU. DNP3 service will start automatically after downloading.

Settings in Simulation PC as DNP3 Master

In simulation PC, download and install software Axon Utility, which supports DNP3 protocol.

(http://www.axongroup.com.co/axongroupen/axon_descargas.php.)

There are many options of software to choose, but we use Axon Utility to do the following demo.

For Axon Utility, it may need registration to get permission of installation.

We could run Freeware License version after installation.

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Using the Freeware version may need to wait to start. After the waiting, you may see below image.

1. In project Explorer, right click on “DNP3” in the “Master” zone.

2. Choose “Add DNP3”.

3. After add DNP3, a random given name will show up, ex. “Cervera”.

4. Scroll down in Properties, edit “Link Address” as “3” (Master) and “Slave Link Address” as

“4” (Slave).

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5. Double click on “Tcp” in “Connections”. Edit the IP same as the IP of ADAM-3600.

6. Edit the scan time in Properties. In “Scan Static”, edit “Loop Scan Time Poll” as “2000”

milliseconds. It makes the Master to inquire data every 2 seconds.

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7. Right click on the random name of DNP3 Master. Run it.

8. After running, you may switch to “Viewer” to check the status.

9. For demonstration to monitor the value, you may change the DO 1 Tag value manually

from 0 to 1 in TagLink.

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10. After the value is changed, you may monitor the status of BinaryOutputStatus from

False to True in “Viewer”.

Terminology

There are several terms defined in DNP3, and we introduce it one-by-one as belows.

For data inquiry, there are 2 terms “Static” and “Event” are used in DNP3.

“Static” represents current value of the monitored data.

“Events” are associated with something of significance happening. User can define events, such

as measured value changes, a measurement whose value crosses one threshold, and analog input

changing by more than its deadband.

There are two methods commonly used for detection of analog input events based on a

deadband.

⎯ Fixed Deadband: If the absolute value of the difference between the present value of

an analog input point and the value that was most recently queued as an event for that

point exceeds the deadband value, then an event is generated for that point.

⎯ Integrating Deadband: The difference between the present value of an analog input

point and the value that was most recently queued as an event for that point is integrated

over time. An event is generated when the absolute value of the integral exceeds the

deadband value.

Event includes following information, Type of event (analog input, binary input, etc), Value, Point

Index, Time when event occurred, Class assignment.

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DNP3 uses the concept of “Classes” to organize static data and events into several categories:

– Class 0: Static data

– Class 1,2,3: Events

The points of most data types may be assigned to one of the four classes.

If a point is assigned to Class 0, the point’s present value shall be reported by the outstation in

its response to a Class 0 poll.

If a point is assigned to one of the event classes (Class 1, 2, or 3), the outstation shall store and

report events for that point, and the point’s present value shall also be reported by the outstation

in its response to a Class 0 poll.

For example, if you want to monitor one specific Analog Input, you may classify it into Class 1. As

a result, whenever the master wants to get the specific data from Analog Input, it may poll from

class 1, instead of polling all data. If the master polls data from class 3, as the above image shows,

the data of Running Counters and Frozen Counters will be reported.

Classifying the event data is one bandwidth-efficient way to update a master each data, which

we call Event Poll. Setting the master to poll a slave frequently for a given amount of time,

especially when the number of events generated in slave is low, using classes for events can make

slave returns much less data than if the master had to retrieve all data on every poll cycle.

Integrity poll is a combined poll of Class 0, 1, 2, and 3.

The setup of classes in slave can allows ADAM-3600 be configured in different classes and report

Class 1, 2 or 3 spontaneously, which is called unsolicited responses.

DNP3 uses Group to indicate different data types. For example, Group 1 is Binary Inputs, Group

10 is Binary Outputs, and Group 30 is Analog Inputs. TagLink has followed DNP3 definition for each

Group. User can view the configuration in “More Parameters” in TagLink.

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Variation represents different data format in one Group. For example, in Group 30, variation 1

is defined as “32-Bit integer with Flag” format, and variation 6 is “64-Bit Floating point.”

DNP3 uses Index to distinguish different points’ values if they are in the same data type. For

example, there are 5 AI points user wants to monitor.

The index 0 is given to AI.0 in TagLink automatically once user adds AI.0, and Index 1, 2, 3, 4 are

given in an orderly way whenever user adds new points.

If DNP3 master wants to inquire AI.2, he needs to set Group 30 (AI), Variation 6 (64-Bit Floating

point), and index 2 in the DNP3 master software.